通过两个动作和一个按钮提交创建表单

Question

In the form I want call one of two Servlet if an event occurred.. Why does it not works?

<form method="post" action="<%=tipo_ricerca.equals('normale') ? VisualizzaRecensioniServlet : VisualizzaRecensioniRicercaVotoServlet;%>">
<a href="javascript:;" onclick="parentNode.submit()">Start</a>
</form>

Answer 1

You are trying to mix javascript and Java in a way that makes no sense.

First of all, you don't even have a submit button; you have a regular link that is not even formatted correctly. Replace

<a href="javascript:;" onclick="parentNode.submit()">Start</a>

with

<input type='submit' value='Start' />

Or, since you don't have any values in your form, you don't really need a form, and thus could just use a link like this:

<a href="<%=tipo_ricerca.equals('normale') ? VisualizzaRecensioniServlet : VisualizzaRecensioniRicercaVotoServlet;%>">Start</a>

Secondly, if you want to call another servlet from Java, use response.sendRedirect() or something of that nature. If you want to call the servlet from Javascript, <%=somevar%> is not of any use for that since the server-side processing is over before Javascript begins running on the client. Unless your intent was to set which servlet to use while the server-side code was being processed.